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On continuum modelling of dense inelastic granular flows of relevance for high shear granulation

Per Abrahamsson (Institutionen för kemi och kemiteknik, Kemisk apparatteknik) ; Srdjan Sasic (Institutionen för tillämpad mekanik, Strömningslära) ; Anders Rasmuson (Institutionen för kemi och kemiteknik, Kemisk apparatteknik)
Powder Technology (0032-5910). Vol. 294 (2016), p. 323-329.
[Artikel, refereegranskad vetenskaplig]

This article investigates a number of possible formulations of a continuum description for modelling dense inelastic granular flows. The revised Enskog theory (RET) for expressing the granular temperature and formulation of transport coefficients has been used within the continuum framework. The framework assumes particles as inelastic spheres and can describe a granular system at a wide range of volume fractions. The transport coefficients depend on the volume fraction through a modified expression for the radial distribution function. The proposed radial distribution function is based on previous studies on the behaviour of the shear viscosity in which an earlier divergence of the latter compared to the other transport coefficients has been demonstrated for sheared dense granular systems. Our results show that the newly developed radial distribution function maintains the ability of RET to predict the occurrence of instabilities in a homogeneous cooling granular gas. The introduced function also improves predictions for the velocity and volume fraction profiles in a Couette cell dense shear flow. Thus the proposed formulation shows promising features in terms of improving predictions for volume fractions relevant in high shear granulators. We have also observed that a different formulation may be needed for the densest regions.

Nyckelord: Dense granular flow; Inelastic; Couette cell; Cooling granular gas; Radial distribution function; Continuum modelling

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Denna post skapades 2016-03-04. Senast ändrad 2016-11-07.
CPL Pubid: 232797


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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Kemisk apparatteknik
Institutionen för tillämpad mekanik, Strömningslära (2005-2017)



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